UI Movable data in MVC

view.py

import sys
from PySide2 import QtCore, QtWidgets, QtGui


class Node(QtGui.QStandardItem):
    def __init__(self):
        super(Node, self).__init__()
        self.name = 'My name'


class ItemModel(QtGui.QStandardItemModel):
    def __init__(self, rows, columns, parent=None):
        super(ItemModel, self).__init__(rows, columns, parent)
        for row in range(0, 4):
            node = Node()
            node.name += str(row)
            self.setItem(row, node)

    def data(self, index, role=QtCore.Qt.DisplayRole):
            if not index.isValid():
                return

            if role == QtCore.Qt.DisplayRole:
                item = self.itemFromIndex(index)
                return item.name

            if role == QtCore.Qt.ForegroundRole:
                return QtGui.QColor(255, 12, 12)

            if role == QtCore.Qt.ToolTipRole:
                item = self.itemFromIndex(index)
                return 'Tooltip + ' + item.name


class ListView(QtWidgets.QListView):
    def __init__(self, parent=None):
        super(ListView, self).__init__(parent)
        model = ItemModel(4, 1, self)
        self.setModel(model)


class Dialog(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(Dialog, self).__init__(parent)
        layout = QtWidgets.QVBoxLayout()
        self.setLayout(layout)

        self.up_button = QtWidgets.QPushButton('Up')
        self.down_button = QtWidgets.QPushButton('Down')

        self.up_button.clicked.connect(self.move_up)
        self.down_button.clicked.connect(self.move_down)

        layout.addWidget(self.up_button)
        layout.addWidget(self.down_button)
        self.view = ListView(self)
        layout.addWidget(self.view)

    def move_up(self):
        row = self.view.currentIndex().row()
        if row <= 0:
            return
        data = self.view.model().takeRow(row)
        self.view.model().insertRow(row - 1, data)

    def move_down(self):
        row = self.view.currentIndex().row()
        if row == self.view.model().rowCount() - 1:
            return
        data = self.view.model().takeRow(row)
        self.view.model().insertRow(row + 1, data)


if __name__ == '__main__':
    app = QtWidgets.QApplication([])
    dialog = Dialog()
    dialog.show()
    sys.exit(app.exec_())